oxNos - See Z p 120 Notation Oxidation state of element is...

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Introduction to OXIDATION NUMBERS Oxidation No.’s are assigned positive values to indicate that an atom has lost e’s and formed + ions, and negative values to indicate that atoms have gained electrons and formed – ions. 1. The oxidation no. of a free, uncombined element = 0. 2. The charge on a simple (monatomic) ion is the oxidation no. of the element in that ion. In a polyatomic ion, the sum of the oxidation no’s of the constituent elements is equal to the charge of the ion. 3. In compounds (ionic or covalent) the sum of the oxidation no.’s of all elements = 0. 4. Ox. No. F = –1 Cl, Br, I = –1 (but can be + with O and other X) 5. H = +1 (except –1 in metal hydrides) 6.
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Unformatted text preview: See Z p 120 Notation: Oxidation state of element is denoted by a Roman numeral: Cu + (I) Fe 2+ (II) Cu 2+ (II) Fe 3+ (III) Ex: a. Osmium (VI) Fluoride Os 6+ + 6Fe-x(+6) + y(–1) = 0 (charge neutrality) OsF 6 b. Vanadium (V) Oxide V 5+ + O-2 x(+5) + y(–2) = 0 (charge neutrality) 2V 5+ + 5O 2-V 2 O 5 c. Copper (I) Sulfide Cu 1+ + S 2-x(+1) + y(–2) = 0 (charge neutrality) 2Cu + + S 2-Cu 2 S Group No of e – Most Common Oxidation No.’s Ionic Comp. Covalent Comp. I 1 1 +1 II 2 2 +2 +2 III 13 3 +3,+1 +3 IV 14 4 (rare) –4, –3,–2,–1,+1,+2,+3,+4 V 15 5 –3 –3,–1,+1,+3,+5 VI 16 6 –2 –2,+2,+4,+6 VII 17 7 –1 –1,+1,+3,+5,+7...
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